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Restructuring - Summary of Restructuring Charges (Details) - Composite Fibers [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Restructuring Cost And Reserve [Line Items]    
Severance and benefit continuation $ 2,689 $ 6,143
Accelerated depreciation 1,352 3,885
Inventory and spare parts 935 935
Other 91 91
Total $ 5,067 $ 11,054